2 * QEMU Block driver for NBD
4 * Copyright (C) 2008 Bull S.A.S.
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
29 #include "qemu-common.h"
33 #include <sys/types.h>
36 typedef struct BDRVNBDState {
42 static int nbd_open(BlockDriverState *bs, const char* filename, int flags)
44 BDRVNBDState *s = bs->opaque;
52 if (!strstart(filename, "nbd:", &host))
55 if (strstart(host, "unix:", &unixpath)) {
57 if (unixpath[0] != '/')
60 sock = unix_socket_outgoing(unixpath);
67 pstrcpy(hostname, 128, host);
69 p = strchr(hostname, ':');
76 port = strtol(p, &r, 0);
79 sock = tcp_socket_outgoing(hostname, port);
85 ret = nbd_receive_negotiate(sock, &size, &blocksize);
91 s->blocksize = blocksize;
96 static int nbd_read(BlockDriverState *bs, int64_t sector_num,
97 uint8_t *buf, int nb_sectors)
99 BDRVNBDState *s = bs->opaque;
100 struct nbd_request request;
101 struct nbd_reply reply;
103 request.type = NBD_CMD_READ;
104 request.handle = (uint64_t)(intptr_t)bs;
105 request.from = sector_num * 512;;
106 request.len = nb_sectors * 512;
108 if (nbd_send_request(s->sock, &request) == -1)
111 if (nbd_receive_reply(s->sock, &reply) == -1)
117 if (reply.handle != request.handle)
120 if (nbd_wr_sync(s->sock, buf, request.len, 1) != request.len)
126 static int nbd_write(BlockDriverState *bs, int64_t sector_num,
127 const uint8_t *buf, int nb_sectors)
129 BDRVNBDState *s = bs->opaque;
130 struct nbd_request request;
131 struct nbd_reply reply;
133 request.type = NBD_CMD_WRITE;
134 request.handle = (uint64_t)(intptr_t)bs;
135 request.from = sector_num * 512;;
136 request.len = nb_sectors * 512;
138 if (nbd_send_request(s->sock, &request) == -1)
141 if (nbd_wr_sync(s->sock, (uint8_t*)buf, request.len, 0) != request.len)
144 if (nbd_receive_reply(s->sock, &reply) == -1)
150 if (reply.handle != request.handle)
156 static void nbd_close(BlockDriverState *bs)
158 BDRVNBDState *s = bs->opaque;
159 struct nbd_request request;
161 request.type = NBD_CMD_DISC;
162 request.handle = (uint64_t)(intptr_t)bs;
165 nbd_send_request(s->sock, &request);
170 static int64_t nbd_getlength(BlockDriverState *bs)
172 BDRVNBDState *s = bs->opaque;
177 static BlockDriver bdrv_nbd = {
178 .format_name = "nbd",
179 .instance_size = sizeof(BDRVNBDState),
180 .bdrv_open = nbd_open,
181 .bdrv_read = nbd_read,
182 .bdrv_write = nbd_write,
183 .bdrv_close = nbd_close,
184 .bdrv_getlength = nbd_getlength,
185 .protocol_name = "nbd",
188 static void bdrv_nbd_init(void)
190 bdrv_register(&bdrv_nbd);
193 block_init(bdrv_nbd_init);